问题
解答题
①(23+27)×(77+73)×25.
②19×27+190×5+19×23.
③23×2×24+25×4×2+27×1×8+25×8×1.
④1250×32×25.
答案
①(23+27)×(77+73)×25
=50×150×25
=187500;
②19×27+190×5+19×23
=19×27+19×50+19×23
=19×(27+23+50)
=19×100
=1900;
③23×2×24+25×4×2+27×1×8+25×8×1
=138×8+27×8+25×8+25×8
=(138+27)×8+(25+25)×8
=165×8+50×8
=1320+400
=1720;
④1250×32×25
=(1250×8)×(4×25)
=10000×100
=1000000.